Internally-protected sheet-metal receptacle.



W. A. SEXTON.

INTERNALLY PROTECTED SHEET METAL RECEPTACLE.

APPLICATION FILED DEC-26.19l4.

Patented Nov. 23, 1915.

ii a T WILLIAM A. sfn'xron, or NEWTON, MASSACHUSETTS.

INTERNALLY-PROTECTED SHEET-METAL RECEPTACLE.

To all whom it may concern:

Be it known that I, WILLIAM A. SE) (TON, a citizen of the United States,and resident of Newton, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inInternally-Protected Sheet-Metal Receptacles, of which the following isaspecification.

This invention relates chiefly to metal receptacles or cans made of tinplate or other metallic sheet material, tin plate being sheet ironcoated with tin.

It is a well-known fact that sheet metal receptacles or cans, if usedfor containmg certain materials, such as liquid shellac, discolor thecontained material.

It is also well known that protective layer of material which isinsoluble by the alcohol in liquid shellac, and is capable of resistingthe action thereof will not adhere to a metal surface, so that a sheetmetal can cannot be protected by applying a protective layer, such asthat hereinafter described, which is insoluble by alcohol, directly toits internal surface. It is therefore customary to store material suchas shellac in non-metallic vessels of earthenware or glass, such vesselsbeingobjectionable on account of their frangibility, cost and weight. I

I have discovered that a sheet metal receptacle, adapted to hold liquidshellac and other like material without discoloring the same, can beproduced by cementing a nonmetallic sheet material, such as paper, to

the inner surface of the metal, such nonmetallic material being adaptedto adhere closely to metal surfaces, and then apply- -i ng to thenon-metallic lining thus formed a protective coating which is adap ed toresist the action of shellac and other materials liable to discolorationby contact with tin or other metal, said protective coating adheringinherently "to the non-metallic lining.

My invention consists in the improved 1nternally protected sheet metalreceptacle hereinafter described and claimed.

Of the accompanying drawmgs forming a part of this specification: Figure1 represents a perspective viewv of a sheet metal plate of indeterminatearea coated on one side with non-metallic sheet material and adapted tobe cut up into blanks forming the members of a sheet metal receptacle orcan; Fig. 2 represents a vertical section of Specification of LettersPatent.

a sheet metal can made from the laminated sheet shown by Fig. 1; Fig. 3is a sectional view showing portions of the three can members beforethey are united; Fig 4: is ail-enlargement of a portion of Fig. 2,showing the protective coating hereinafter described.

The same reference characters indicate the same or similar parts in allthe views.

In carrying out my invention I prefer to proceed as follows: Taking asheet a of ordinary tin plate, or other metallic sheet material, Icement to one side of the same a non-metallic lining layer 6, preferablyof paper. 1 have used for the layer Z) the socalled Kraft paper, but Ido not limit myself thereto. I find that paper may be permanently unitedto a metal surface by various kinds of paste, glue or cement. The lininglayer 6 entirely covers one side of the metallic layer a 1 next cut upthe laminated sheet constructed as above described, to form blanks forthe members of a sheet metal can, the form of the members depending onthe form of the can. I have indicated by dotted lines in Fig. 1 thelines along which the laminated sheet may be cut. It will be seen thateach member cut from the metal sheet is wholly covered on one side bynon-metallic sheet material.

Fig.2 illustrates a can formed by assembling members out from thelaminated sheet, 12 representing the body, 13 the bottom, and 14 the topor head of the can, there being at least three members, and the form ofboth ends of the can being determined by the joints which unite saidmembers.

The members out from the laminated sheet are formed and united inaccordance with the ordinary practice of making sheet metal cans, saidmembersbeing preferably united by seamed joints 15, and each member andits lining layer being handled as one piece or part during the operationof assembling the, members. The non-metallic lining layers of the canmembers, being co-extensive with the inner sides of said members, eXtendthrough the joints and pack the latter,as shown by Figs. 2 and 4, thematerial of the non-metallic layers being compressible, and compressedby the joint forming portions of the can members, and thereforecontributing to the tightness of the joints. 4

A can constructed as thus far described may be used for various purposesWithout Patented Nov. 23, 1915.

Application filedJJecember 26, 1914. Serial No. 879,177.

the protective coating hereinafter described, but said protectivecoating is essential-for cans intended to contain materials liable todiscoloration by contact with metal and capable of seeping through thenon-metallic lining layers.

To complete the internal protection of the can, I apply to thenon-metallic lining tective coating is shown insolid black, and

is designated by the reference letter 0.

' It should be borne in mind that while the described coating will notadhere satisfactorily to a metal surface and is liable to flake or peeltherefrom, it is firmly maintained by the-non-metallic lining layer 5 inthe form of a continuous protective layer covering all parts of theinner surface of the can and entering the crevices adjacent to thejoints15. Owing to the fact that a part of the material of the protectivelayer is absorbed, as above stated, by the lining layer, the protectivelayer may be said to be reinforced by the lining layer, and preventedfrom crackingas well as frompeeling or flaking off.

I have found that a sheet metal can protected as described is capable ofholding shellac for along. period without the slightest discoloration. ip

My invention is not limited to the mate- I rials herein described forthe lining layer and the protective coating. Neither is my inventionlimited to the protection of tin plate in the manner described, it beingobvious that other varieties ,of sheet metalmay be similarly protected.

As above intimated, the sheet metal may be-protected and its jointspacked only by the non-metallic lining, the protective coating beingomitted when the can is intended to hold materials which will not bediscolored by contact with the metallic surfaces due to seepage throughthe non-metallic lining.

I am awarethat it hasbeen proposedto coat the interior of a sheet metalcan with asphaltum cement composed 1 of. asphaltum dissolved in asuitable solvent. While asphaltum cement may adhere firmly to sheetmetal, it is soluble in alcohol, and is therefore incapable ofprotecting the metal against liquid shellac, the fact being that acoating of asphaltum cement would be speedily dissolved by the alcoholcontained in. liquid shellac,.so that the shellac would be discolorednot only by contact with the sheet metal, but also by the dissolvedcement.

I have found that a coating of material such as linseed oil varnish,which is insoluble in alcohol, will not adhere to sheet metal and willadhere to'paper, which in turn is adapted to be firmly cemented to sheetmetal. Having described my invention, I claim:

1. An internally protected sheet metal receptacle formed of a pluralityof interengaged blanks, and having a non-metallic layer of flexiblefibrous material possessing a substantial degree of toughness andstrength cemented to and coextensive with the blanks of which thereceptacle is formed, said layer being extended into and packing thejoints where said blanks are interengaged in the completed receptacle.

2. An internally protected sheetmetal receptacle formed of aplurality'of interengaged blanks, and having a non-metallic layer offlexible fibrous material possessing a substantial degree of toughnessand strength cemented to and coextensive with the blanks of which thereceptacle is formed, said layer being extended into and packing thejoints where said blanks are interengaged in the completed receptacle,and a protective coating which is inherently adherent to said lining andpartly absorbed and reinforced thereby.

3. An internally protected sheet metal rcceptacle formed of a pluralityof interengaged blanks, and having a non-metallic layer of flexiblefibrous material possessin a substantial degree of toughness an strengthcemented to and coextensive with the blanks of which the receptacleisformed, said layer being extendedinto and packing the joints Wheresaid blanks are interengaged in the completed receptacle, a protec-'tive coating which is inherently adherent to said lining and partlyabsorbed and reinforced thereby, said coating being insoluble in alcoholandnon-adherent to the metal of which the receptacle is constructed.

In testimony whereof I have aflixed my signature, in presence of twowitnesses.

WILLIAM A. SEXTON. Witnesses:

P. w. PEzzETTi, C. F. BROWN.

